Only two known ways to prepare shitonastik. 1) By using hands to gather shit around the popsickle stick, much like how a fish stick or chicken nugget is formed. 2) By allowing stick to be thrust into the anus and twirled as to allow build up of shit on stick.

A game invented in 1973 on a housing estate called East Herringthorpe in Rotherham, South Yorkshire. It was decided that kids were not running fast enough in the persuit of their usual games so to make it more interesting a stick was dipped in dog shite and then used to encourage kids to run faster. The game didn't last long as parents got tired of washing clothes that smelled of dog shite, however, this infamous game stood the test of time and is still talked about today 37 years later.

Dean: Eyup Phil dus tha want a game of British Bulldog?
Phil: Aye all reet, I'll go an get t'stick an dip it in some shit t' mek it moor interestin'.
Dean: Shit-on-a-stick? Great idea, I'll goo an get t'other lads see ya in a mo

In mission Impossible when he was lowering himself down over the touch sensitive floor if he needed a shit he would have brought a stick to shit on. eg
"Hey Ethan, what's up?"
"I need to shit badly!"
"Why don't you shit on a stick?"
"Perfect!!!"